... lubricating system 2.Hydraulic-pressure device 3.Reliable performacne High quality!!! double-stage crusher The advantages of Two-Stages Crusher ... hard materials such as coal slack,shale,cinder, construction waste,slag,furnace slag,cement,refractories, heat insulating materials,etc. ... , there is no screen and grate, the wet material can’t be blocked up. 2.Wear-resistant combination hammerhead, ...